Build and test with CUDA 12.8.0

[bdice]

This PR uses CUDA 12.8.0 to build and test.

xref: rapidsai/build-planning#139

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[jameslamb]

One test failed with what looks like a network error downloading some test data from GitHub.

cux_df = <cuxfilter.dataframe.DataFrame object at 0x7f46223787f0>

    @pytest.mark.parametrize("cux_df", cux_dfs)
    def test_init(self, cux_df):
>       choropleth3d_chart = charts.choropleth(
            x="states",
            color_column="val",
            elevation_column="val_t",
            color_aggregate_fn="mean",
            elevation_aggregate_fn="count",
            add_interaction=False,
            elevation_factor=100000,
            geoJSONSource=(
                "https://raw.githubusercontent.com/loganpowell/census-geojson"
                "/master/GeoJSON/5m/2018/state.json"
            ),
            geoJSONProperty="STATEFP",
            map_style="testMap",
        )

...
/opt/conda/envs/test/lib/python3.10/ssl.py:1375: ConnectionResetError

(build link)

I checked and the file really is there, so I guess this was just something temporary (https://github.com/rapidsai/cuxfilter/actions/runs/13014410941/job/36301473875?pr=649).

Restarted CI for you. I also opened #650 documenting the work to try to factor out that download.

Left one other suggestion about a few more updates that were missed in docs.

Approving, assuming those docs updates will be made. I don't need to re-review.

[vyasr]

/merge